Melatonin has been shown to help prevent lethal toxins from anthrax exposure.
(1) It boosts glutathione levels during sleep.

Made in the pineal gland, melatonin is the hormone that controls your biological clock.

Melatonin is also a powerful antioxidant in addition to its role as a hormone.

Melatonin supplements are found to boost the immune function in the young, middle-aged, and elderly.

It was found to dramatically improve the immune response to both cancers and infections. In one study involving cancer patients, supplemental melatonin was found to substantially increase the number of T cells, natural-killer cells, and other types of white blood
cells.(2)

Melatonin also enhances antibody
production.(3) It was found to counteract the immune suppression associated with cortisone-type
drugs.(4)

Animal experiments have demonstrated that melatonin supplements reduced the severity of viral infections of the brain and increased the survival rate by almost 50 percent.
(5) Melatonin also is believed to slow the replication of HIV and improve immune function in patients with AIDS.
(6)

Dosage Recommendations

Melatonin is very safe. Too much melatonin can exacerbate depression.

The dosage needed varies from person to person. Do some experimentation. The usual dosage varies from 0.5 mg to several milligrams per day.